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Re: st: pairwise test of proportions


From   Phil Clayton <philclayton@internode.on.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: pairwise test of proportions
Date   Wed, 20 Oct 2010 12:12:05 +1100

Not sure about earlier versions but in version 11 -prtest- can perform one-sample, two-sample (ie paired) or two-group comparisons depending on the syntax used.

The two-group syntax is:
prtest varname, by(groupvar)

You can also use -mcc- to calculate McNemar's chi-squared for paired proportions.

Phil

On 20/10/2010, at 10:42 AM, Richard Williams wrote:

> At 06:30 PM 10/19/2010, Stas Kolenikov wrote:
>> On Tue, Oct 19, 2010 at 5:12 PM, helen bian <helenbian06@gmail.com> wrote:
>> > Has anyone written a program that does a pairwise test of proportions
>> > and contains the p-values in its output?
>> 
>> Is it -prtest- or -prtesti-?
> 
> That was my first impulse.  However, the documentation refers to "Two-sample test of proportion." From the examples, I got the impression it was for unpaired samples. ttest, by way of contrast, refers to "Two-sample mean-comparison test (unpaired)" and "Two-sample mean-comparison test (paired)". So, ttest lets you do something like a before and after comparison of the same subjects; prtest sounds to me like it is comparing proportions for two different samples, rather than paired values.
> 
> 
> -------------------------------------------
> Richard Williams, Notre Dame Dept of Sociology
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